How Many Pounds Of Strawberries?

I was asked to make strawberry short cake for 300 people. I can totally figure out how much pound cake to make, kind of how much whipped cream to make... but how many pounds of strawberries do I need to buy? I'm trying to price this out before the event (April 19th) to give them enough time to discuss other options... So, strawberries for 300? Thoughts?